Cotton gin



D. D. DAY

COTTON GIN Nov. 10, 1953 3 Sheets-Sheet 1 Filed Oct. 16, 1950 Dewey 0. Day

INVENTOR.

D. D. DAY

COTTON GIN Nov. 10, 1953 3 Sheets-Sheet 2 Filed Oct. 16, 1950 Dewey& Day

' INVENTOR.

Nov. 10, 1953 D. D. DAY 2,658,239

COTTON GIN 'Filed Oct. 16, 1950 s Sheets-Sheet 3 T Dewey D. Day

I H INVENTOR.

Patented Nov. 10, 1953 COTTON GIN Dewey D. Day, Dallas, Tex., assignor to The Murray Company of Texas, Inc., Dallas, Tex., a corporation of Delaware Application October 16, 1950, Serial No. 190,401

9 Claims. 1

This invention relates to new and useful improvements in cotton gin moting devices.

One object of the invention is to provide improved moting means for cotton gins, whereby the percentage of motes and trash removed from the saw teeth is greatly increased.

A further object of the invention is to provide an improved moting arrangement wherein the upper chamber of the stand in the rear of the saws is shut off and provided with a controlled discharge to the mote hopper below, whereby more efiicient moting is had.

Another object of the invention is to provide an improved moting device wherein motes and trash are efliciently removed from the saw teeth and certain light trash, which heretofore has been diflicult to control, is cast from the saw cylinder and prevented from again being drawn back into the lint stream.

A still further object of the invention is to provide an improved moting device wherein a pair of moting rollers are mounted in sequence outwardly of the saw cylinder in rear of the latter, whereby a much higher percentage of motes and trash are permanently removed from the cotton.

A construction designed to carry out the invention will be hereinafter described together with other features of the invention.

The invention will be more readily understood from a reading of the specification and by reference to the accompanying drawings, wherein examples of the invention are shown, and wherein:

Fig. 1 is a transverse, vertical, sectional view of a cotton gin stand equipped with a moting device constructed in accordance with the invention,

Fig. 2 is an enlarged sectional view of a portion of the device,

Fig. 3 is an enlarged transverse, vertical, sectional view of the upper rear portion of a gin stand showing the moting device therein,

Fig. 4 is a partial View of the moting roller, partly in perspective and partly in section,

Fig. 5 is an end view of a gin stand, partly in elevation and partly in section, to show a modified form of the invention,

Fig. 6 is an enlarged transverse, vertical, sectional view of the upper moting section of the stand, and

Fig. 7 is a partial end elevation of the stand showing the damper adjusting means.

In the drawings the numeral I0 designates, in general, a gin stand having vertical end walls II, a saw cylinder I2, an air duct l3, an air supply duct I4, an air nozzle I5 and a lint flue I6, leading from the saws. These parts are regular elements of an ordinary gin stand.

The improvement has to do with the disposal of the motes, dirt and dust cast off the saws between the ribs l1 and a transverse stripper bar I8, mounted on top of the nozzle l5. The stripper bar is L-shape in cross-section, having the back of its upright leg contiguous to the saws and its horizontal leg directed outwardly over the nozzle. The upper edge portion IQ of the stripper bar is bent slightly toward the saw teeth and is reduced to an edge so as to better strip the motes and trash from the saw teeth.

A longitudinal mote plate 20 is mounted on the stripper bar and suitably secured across the angle of said stripper bar. The plate has its lower portion 2| curved downwardly so as to overhang the top of the nozzle l5, as Well as to overhang the front of said nozzle. A pair of moting rollers 22 and 23, respectively, are mounted in the moting chamber. The front roller 22 is disposed concentrically to the upper transverse curvature of the plate 20.

Both rollers are journaled in the end plates II and the rear roler 23 is centered on an angle of about below the roller 22. The roller 23 is about twice the diameter of the front roller 22, but they are both driven at about the same peripheral speed and revolve toward each other so as to carry material downwardly therebetween. The rear roller 23 wipes up a curved shield 24 mounted in the gin stand, thus the only exit, downwardly, is in the space between the flights of the two rollers.

Each roller is of the usual construction, common in this art and includes elongate flexible flights 25, disposed longitudinally on its outer periphery. These flights are formed of rubberized strips, suitably secured along their inner edges to the roller so that their outer edges are free and flexible. The outer edges of the flights of the roller 22 wipe up the curved surface of the upper curved portion of the plate 20, thus keeping the roller clean. Because of the direction of revolution of the roller 22 and its location, motes and trash thrown off the saws are prevented from lodging on the bar I9 and plate 20 and are cast, by said roller 22, into the stand above the rear roller 23.

It is obvious that as the saws I2 revolve and carry the cotton lint between the ribs I1, the motes and trash are thrown off between the ribs and the stripper bar I8. It has been found that some of the heavy motes are cast off under such force as to carry them over both rollers and into contact with the back of the gin housing. Suction applied through conduit I5 induces air currents to flow downwardly between the rollers and through the duct I l so that all of the motes and trash are drawn down into the hopper 26 below the roller 23 and carried out by the screw conveyor 21. While this downward suction is suflicient. to keep the flights clean there is substantially no suction directly on the saws i2 because the air is drawn into the enclosure through the front of the gin between the saws and ribs and at the ends of the saw cylinder. Further, a suction is not exerted. directly on the saw cylinder because the air is pulled over the top of the roller 22, thus the lint of good quality is not removed from the saw teeth.

Tests have shown that by use of the invention, an increase by weight, of motes and trash removed, amounts to 50% and more. This increase is made up largely of light trash, such as has been heretofore, very difficult to remove and which frequently found its way back into the lint stream. By providing. the reduced upper edge l9 on the stripper bar, motes and trash which would otherwise be carried down by the sawsis stripped off and cast by the roller .22, rearwardly.

In. Figs. 5, 6 and '7, I have shown a modified form wherein the roller 23' is mounted closer to the roller 22' so as to cause the edge portions of the flights 25 to wipe across each other and further to cause. the motes and trash to be cast downwardly at the rear of the roller 23'. In this form the roller 22' isrevolved in the same direction as the. roller 22 in Fig. 1; however, the direction of rotation of. the roller 23' (Figs. 5 and 6) is reversed so that the motes and trash are cast from the roller 22 onto the roller 23 and are carried down. the rear side of the latter.

The roller 23 is revolved faster than the roller 22, so as to cause the edges of flights 25 of the roller 23, in passing upwardly to wipe the material from the edge portions of the flights of the roller 22. This removed material is carried over and, rearward by the flights of the roller 23'. Inthe rear of theroller 23' a damper 2'! is hung from a. transverse shaft 28 journaled in the end walls H. The lower portion of the damper has a vertically curved apron 29, approximately conforming to the arc in which the outer edges of the flights 25 of the roller 23 travel. The shaft 28 extends through one of the end walls II and has an adjusting lever 30 thereon, as is shown in Fig. 7. This lever engages a toothed segment 3!, as is common in this art, whereby the damper is held in adjusted positions. By adjusting the lever 3!], the apron is spaced from the edges of the flights so as to control the volume of air discharged downwardly. Under some conditions the modified form is found more desirable.

The foregoing description of the invention is explanatory thereof and various changes in the size, shape and materials, as well as in the details of the illustrated construction may be made, within the scope of the appended claims, without departing from the spirit of the invention.

What I claim and desire to secure by Letters Patent is:

1. In a cotton gin stand, the combination of, ginning ribs, saws revolving between the ribs, an air blast nozzle adjacent the saws, an upper moting chamber open to the saws between the ribs and the nozzle, a pair of rollers disposed transversely of the gin stand in the rear of the saws and constituting the bottom of the upper moting chamber, and a lower mote chamber in the stand below the rollers, one of the rollers being forward of the other roller and above the nozzle adjacent the saws and the other roller being in rear of the nozzle, said rollers coacting to carry motes-and trash from the upper moting chamber. to the lower chamber, and means between the top of the nozzle and the forward roller for stripping motes and trash from the saws.

2. A cotton gin stand as set forth in claim 1, wherein the stripping means includes a stripper bar. adjacent the saws above the nozzle.

3. A cotton gin stand as set forth in claim 1 whereinv the rollers have peripheral yieldable flights.

4'. A cotton gin stand as set forth in claim 1, wherein one of the rollers is revolved at a higher rate of peripheral speed than the other roller and said rollers. have longitudinal peripheral yieldable flights in wiping contact whereby the flights of the higher speed roller wipe the flights of the other roller.

5. In a cotton gin stand, the combination of, ginning ribs, saws revolving between the ribs, an air blast nozzle adjacent the saws, an upper moting chamber open to the saws between the ribs and the nozzle, a pair of rollers disposed transversely of the gin stand in rear of the saws and constituting the bottom of the upper moting chamber, one of the rollers being forward of the other roller, said rollers having longitudinal peripheral yieldable flights in wiping contact with each other, a damper contiguous to the roller at the rear of the upper moting chamber, means for adjusting said damper with relation to the rear roller to control the discharge of material downwardly from said rear roller, and a lower mote chamber below the rollers;

6. In a cotton gin stand, the combination of,

ginning ribs, saws revolving between the ribs, an

air blast nozzle adjacent the saws, an upper moting chamber open to the saws between the ribs and the nozzle, a pair of rollers disposed transversely of the gin stand in rear of the saws and constituting the. bottom of the upper moting chamber, one of the rollers being forward of the other roller and above the nozzle, said rollers having longitudinal peripheral yieldable flights in wiping contact with each other, a damper contiguous to the roller at the rear of the upper moting chamber, means for adjusting said damper with relation to the rear roller to control the discharge of material downwardly from said rear roller, a lower mote chamber below, the rollers, a stripper bar extending across the saws immediately above the nozzle, and an elongate mote plate along the bar and over the nozzle havinga portion concentric to the forward roller.

'7. In combination with the gin saws and air blast nozzle of a cotton gin, a pair of moting rollers disposed longitudinally one relatively above and in rear of the gin saws, one of the rollers being forward of the other roller and being spaced from the saws and above the nozzle, the other roller being rearward of the nozzle, and a stripper bar contiguous to the teeth of the saws and between the top of the nozzle and the forward roller, said rearward roller coacting with the forward roller to carry motes and trash downwardly in the gin.

8. The combination set forth in claim 7 including, a mote plate mounted longitudinally along the stripper bar and contacted by the forward roller.

9. The combination set forth in claim '7 including, a mote plate mounted longitudinally along the stripper bar, the forward roller having elastic longitudinal flights disposed to wipe the mote plate.

DEWEY D. DAY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Balusek Aug. 17, 1926 Hart Feb. 19, 1929 Blewett Feb. 25, 1936 Canet al. Aug. 31, 1943 Smith Nov. 29, 1949 streun Jan. 2, 1951 Streun Jan. 2, 1951 

